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# 2001 September 15
#
# The author disclaims copyright to this source code. In place of
# a legal notice, here is a blessing:
#
# May you do good and not evil.
# May you find forgiveness for yourself and forgive others.
# May you share freely, never taking more than you give.
#
#***********************************************************************
# This file implements regression tests for SQLite library. The
# focus of this script is database locks.
#
# $Id: lock.test,v 1.40 2009/06/16 17:49:36 drh Exp $
set testdir [file dirname $argv0]
source $testdir/tester.tcl
# Create an alternative connection to the database
#
do_test lock-1.0 {
# Give a complex pathname to stress the path simplification logic in
# the vxworks driver and in test_async.
file mkdir tempdir/t1/t2
sqlite3 db2 ./tempdir/../tempdir/t1/.//t2/../../..//test.db
set dummy {}
} {}
do_test lock-1.1 {
execsql {SELECT name FROM sqlite_master WHERE type='table' ORDER BY name}
} {}
do_test lock-1.2 {
execsql {SELECT name FROM sqlite_master WHERE type='table' ORDER BY name} db2
} {}
do_test lock-1.3 {
execsql {CREATE TABLE t1(a int, b int)}
execsql {SELECT name FROM sqlite_master WHERE type='table' ORDER BY name}
} {t1}
do_test lock-1.5 {
catchsql {
SELECT name FROM sqlite_master WHERE type='table' ORDER BY name
} db2
} {0 t1}
do_test lock-1.6 {
execsql {INSERT INTO t1 VALUES(1,2)}
execsql {SELECT * FROM t1}
} {1 2}
# Update: The schema is now brought up to date by test lock-1.5.
# do_test lock-1.7.1 {
# catchsql {SELECT * FROM t1} db2
# } {1 {no such table: t1}}
do_test lock-1.7.2 {
catchsql {SELECT * FROM t1} db2
} {0 {1 2}}
do_test lock-1.8 {
execsql {UPDATE t1 SET a=b, b=a} db2
execsql {SELECT * FROM t1} db2
} {2 1}
do_test lock-1.9 {
execsql {SELECT * FROM t1}
} {2 1}
do_test lock-1.10 {
execsql {BEGIN TRANSACTION}
execsql {UPDATE t1 SET a = 0 WHERE 0}
execsql {SELECT * FROM t1}
} {2 1}
do_test lock-1.11 {
catchsql {SELECT * FROM t1} db2
} {0 {2 1}}
do_test lock-1.12 {
execsql {ROLLBACK}
catchsql {SELECT * FROM t1}
} {0 {2 1}}
do_test lock-1.13 {
execsql {CREATE TABLE t2(x int, y int)}
execsql {INSERT INTO t2 VALUES(8,9)}
execsql {SELECT * FROM t2}
} {8 9}
do_test lock-1.14.1 {
catchsql {SELECT * FROM t2} db2
} {0 {8 9}}
do_test lock-1.14.2 {
catchsql {SELECT * FROM t1} db2
} {0 {2 1}}
do_test lock-1.15 {
catchsql {SELECT * FROM t2} db2
} {0 {8 9}}
do_test lock-1.16 {
db eval {SELECT * FROM t1} qv {
set x [db eval {SELECT * FROM t1}]
}
set x
} {2 1}
do_test lock-1.17 {
db eval {SELECT * FROM t1} qv {
set x [db eval {SELECT * FROM t2}]
}
set x
} {8 9}
# You cannot UPDATE a table from within the callback of a SELECT
# on that same table because the SELECT has the table locked.
#
# 2006-08-16: Reads no longer block writes within the same
# database connection.
#
#do_test lock-1.18 {
# db eval {SELECT * FROM t1} qv {
# set r [catch {db eval {UPDATE t1 SET a=b, b=a}} msg]
# lappend r $msg
# }
# set r
#} {1 {database table is locked}}
# But you can UPDATE a different table from the one that is used in
# the SELECT.
#
do_test lock-1.19 {
db eval {SELECT * FROM t1} qv {
set r [catch {db eval {UPDATE t2 SET x=y, y=x}} msg]
lappend r $msg
}
set r
} {0 {}}
do_test lock-1.20 {
execsql {SELECT * FROM t2}
} {9 8}
# It is possible to do a SELECT of the same table within the
# callback of another SELECT on that same table because two
# or more read-only cursors can be open at once.
#
do_test lock-1.21 {
db eval {SELECT * FROM t1} qv {
set r [catch {db eval {SELECT a FROM t1}} msg]
lappend r $msg
}
set r
} {0 2}
# Under UNIX you can do two SELECTs at once with different database
# connections, because UNIX supports reader/writer locks. Under windows,
# this is not possible.
#
if {$::tcl_platform(platform)=="unix"} {
do_test lock-1.22 {
db eval {SELECT * FROM t1} qv {
set r [catch {db2 eval {SELECT a FROM t1}} msg]
lappend r $msg
}
set r
} {0 2}
}
integrity_check lock-1.23
# If one thread has a transaction another thread cannot start
# a transaction. -> Not true in version 3.0. But if one thread
# as a RESERVED lock another thread cannot acquire one.
#
do_test lock-2.1 {
execsql {BEGIN TRANSACTION}
execsql {UPDATE t1 SET a = 0 WHERE 0}
execsql {BEGIN TRANSACTION} db2
set r [catch {execsql {UPDATE t1 SET a = 0 WHERE 0} db2} msg]
execsql {ROLLBACK} db2
lappend r $msg
} {1 {database is locked}}
# A thread can read when another has a RESERVED lock.
#
do_test lock-2.2 {
catchsql {SELECT * FROM t2} db2
} {0 {9 8}}
# If the other thread (the one that does not hold the transaction with
# a RESERVED lock) tries to get a RESERVED lock, we do get a busy callback
# as long as we were not orginally holding a READ lock.
#
do_test lock-2.3.1 {
proc callback {count} {
set ::callback_value $count
break
}
set ::callback_value {}
db2 busy callback
# db2 does not hold a lock so we should get a busy callback here
set r [catch {execsql {UPDATE t1 SET a=b, b=a} db2} msg]
lappend r $msg
lappend r $::callback_value
} {1 {database is locked} 0}
do_test lock-2.3.2 {
set ::callback_value {}
execsql {BEGIN; SELECT rowid FROM sqlite_master LIMIT 1} db2
# This time db2 does hold a read lock. No busy callback this time.
set r [catch {execsql {UPDATE t1 SET a=b, b=a} db2} msg]
lappend r $msg
lappend r $::callback_value
} {1 {database is locked} {}}
catch {execsql {ROLLBACK} db2}
do_test lock-2.4.1 {
proc callback {count} {
lappend ::callback_value $count
if {$count>4} break
}
set ::callback_value {}
db2 busy callback
# We get a busy callback because db2 is not holding a lock
set r [catch {execsql {UPDATE t1 SET a=b, b=a} db2} msg]
lappend r $msg
lappend r $::callback_value
} {1 {database is locked} {0 1 2 3 4 5}}
do_test lock-2.4.2 {
proc callback {count} {
lappend ::callback_value $count
if {$count>4} break
}
set ::callback_value {}
db2 busy callback
execsql {BEGIN; SELECT rowid FROM sqlite_master LIMIT 1} db2
# No busy callback this time because we are holding a lock
set r [catch {execsql {UPDATE t1 SET a=b, b=a} db2} msg]
lappend r $msg
lappend r $::callback_value
} {1 {database is locked} {}}
catch {execsql {ROLLBACK} db2}
do_test lock-2.5 {
proc callback {count} {
lappend ::callback_value $count
if {$count>4} break
}
set ::callback_value {}
db2 busy callback
set r [catch {execsql {SELECT * FROM t1} db2} msg]
lappend r $msg
lappend r $::callback_value
} {0 {2 1} {}}
execsql {ROLLBACK}
# Test the built-in busy timeout handler
#
do_test lock-2.8 {
db2 timeout 400
execsql BEGIN
execsql {UPDATE t1 SET a = 0 WHERE 0}
catchsql {BEGIN EXCLUSIVE;} db2
} {1 {database is locked}}
do_test lock-2.9 {
db2 timeout 0
execsql COMMIT
} {}
integrity_check lock-2.10
# Try to start two transactions in a row
#
do_test lock-3.1 {
execsql {BEGIN TRANSACTION}
set r [catch {execsql {BEGIN TRANSACTION}} msg]
execsql {ROLLBACK}
lappend r $msg
} {1 {cannot start a transaction within a transaction}}
integrity_check lock-3.2
# Make sure the busy handler and error messages work when
# opening a new pointer to the database while another pointer
# has the database locked.
#
do_test lock-4.1 {
db2 close
catch {db eval ROLLBACK}
db eval BEGIN
db eval {UPDATE t1 SET a=0 WHERE 0}
sqlite3 db2 ./test.db
catchsql {UPDATE t1 SET a=0} db2
} {1 {database is locked}}
do_test lock-4.2 {
set ::callback_value {}
set rc [catch {db2 eval {UPDATE t1 SET a=0}} msg]
lappend rc $msg $::callback_value
} {1 {database is locked} {}}
do_test lock-4.3 {
proc callback {count} {
lappend ::callback_value $count
if {$count>4} break
}
db2 busy callback
set rc [catch {db2 eval {UPDATE t1 SET a=0}} msg]
lappend rc $msg $::callback_value
} {1 {database is locked} {0 1 2 3 4 5}}
execsql {ROLLBACK}
# When one thread is writing, other threads cannot read. Except if the
# writing thread is writing to its temporary tables, the other threads
# can still read. -> Not so in 3.0. One thread can read while another
# holds a RESERVED lock.
#
proc tx_exec {sql} {
db2 eval $sql
}
do_test lock-5.1 {
execsql {
SELECT * FROM t1
}
} {2 1}
do_test lock-5.2 {
db function tx_exec tx_exec
catchsql {
INSERT INTO t1(a,b) SELECT 3, tx_exec('SELECT y FROM t2 LIMIT 1');
}
} {0 {}}
ifcapable tempdb {
do_test lock-5.3 {
execsql {
CREATE TEMP TABLE t3(x);
SELECT * FROM t3;
}
} {}
do_test lock-5.4 {
catchsql {
INSERT INTO t3 SELECT tx_exec('SELECT y FROM t2 LIMIT 1');
}
} {0 {}}
do_test lock-5.5 {
execsql {
SELECT * FROM t3;
}
} {8}
do_test lock-5.6 {
catchsql {
UPDATE t1 SET a=tx_exec('SELECT x FROM t2');
}
} {0 {}}
do_test lock-5.7 {
execsql {
SELECT * FROM t1;
}
} {9 1 9 8}
do_test lock-5.8 {
catchsql {
UPDATE t3 SET x=tx_exec('SELECT x FROM t2');
}
} {0 {}}
do_test lock-5.9 {
execsql {
SELECT * FROM t3;
}
} {9}
}
do_test lock-6.1 {
execsql {
CREATE TABLE t4(a PRIMARY KEY, b);
INSERT INTO t4 VALUES(1, 'one');
INSERT INTO t4 VALUES(2, 'two');
INSERT INTO t4 VALUES(3, 'three');
}
set STMT [sqlite3_prepare $DB "SELECT * FROM sqlite_master" -1 TAIL]
sqlite3_step $STMT
execsql { DELETE FROM t4 }
execsql { SELECT * FROM sqlite_master } db2
execsql { SELECT * FROM t4 } db2
} {}
do_test lock-6.2 {
execsql {
BEGIN;
INSERT INTO t4 VALUES(1, 'one');
INSERT INTO t4 VALUES(2, 'two');
INSERT INTO t4 VALUES(3, 'three');
COMMIT;
}
execsql { SELECT * FROM t4 } db2
} {1 one 2 two 3 three}
do_test lock-6.3 {
execsql { SELECT a FROM t4 ORDER BY a } db2
} {1 2 3}
do_test lock-6.4 {
execsql { PRAGMA integrity_check } db2
} {ok}
do_test lock-6.5 {
sqlite3_finalize $STMT
} {SQLITE_OK}
# At one point the following set of conditions would cause SQLite to
# retain a RESERVED or EXCLUSIVE lock after the transaction was committed:
#
# * The journal-mode is set to something other than 'delete', and
# * there exists one or more active read-only statements, and
# * a transaction that modified zero database pages is committed.
#
set temp_status unlocked
if {$TEMP_STORE>=2} {set temp_status unknown}
do_test lock-7.1 {
set STMT [sqlite3_prepare $DB "SELECT * FROM sqlite_master" -1 TAIL]
sqlite3_step $STMT
} {SQLITE_ROW}
do_test lock-7.2 {
execsql { PRAGMA lock_status }
} [list main shared temp $temp_status]
do_test lock-7.3 {
execsql {
PRAGMA journal_mode = truncate;
BEGIN;
UPDATE t4 SET a = 10 WHERE 0;
COMMIT;
}
execsql { PRAGMA lock_status }
} [list main shared temp $temp_status]
do_test lock-7.4 {
sqlite3_finalize $STMT
} {SQLITE_OK}
do_test lock-999.1 {
rename db2 {}
} {}
finish_test